Accuracy of the intermediate frequency and the high frequency, of the optical components, are enhanced during the ultra-smooth processing, under the premise of non-deterioration of its surface accuracy. The uniform removal is an important way to ensure of non-degradation of the surface accuracy of the optical components during the ultra-smooth processing. On the basis of the four-axis three linkage machine with small grinding heads, used for ultra-smooth processing , combined with the Preston hypothesis, the characteristics of the material removal of the optical components are studied. When the machine takes some specific parameters, uniform removal of the surface material of the optical element can be achieved with equivalent dwell time. Finally, comparison tests are done to test the specific parameters. The test results confirm the results of the theoretical analysis.